mocks.cr

require "spec"

class Double
  def initialize(@name, @stubs = {} of Symbol => Object)
  end

  def receives_and_returns(method_name = :none, return_value = true)
    stubs[method_name] = return_value
  end

  macro method_missing(name, args, block)
    if stubs.try &.[:{{name}}]?
      stubs[:{{name}}]
    else
      fail "Double \"#{name}\" received unexpected message :#{{{name}}}"
    end
  end

  private getter :name, :stubs, :current_stub_name
end

describe "Mocks" do
  it "tests a double" do
    d = Double.new("Double", { hello: "Hello World" })

    d.hello.should eq "Hello World"
  end

  it "can be added stubs after initialization" do
    d = Double.new("Double")
    d.receives_and_returns(method_name: :hello, return_value: 123)

    d.hello.should eq 123
  end
end

I would like to have a hash where the keys are symbols, but how do I compare that to {{name}}, if there is no to_sym?

Also, I don't like to have to declare the Value type, any way around it?

1. if stubs.has_key?(:{{name}}) (note the colon)
2. {} of String => _

No, 2 is wrong. Why not @stubs = nil and then @stubs.try &.[key]?